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Loans and Allowance for Loan Losses (Details 10) (USD $)
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Allowance related to loans categorized as troubled debt restructurings            
Total $ 24,947,000 $ 26,035,000 $ 28,677,000 $ 29,689,000 $ 30,943,000 $ 36,532,000
Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 13,714,000   13,097,000      
Commercial and industrial [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 680,000   772,000      
Vacant land, land development and residential construction [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 1,204,000   713,000      
Real estate - owner occupied [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 921,000   1,116,000      
Real estate - non-owner occupied [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 9,517,000   9,751,000      
Real estate - multi-family and residential rental [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 748,000   745,000      
Total commercial [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 13,070,000   13,097,000      
Home equity and other [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 0   0      
1 - 4 family mortgages [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total 644,000   0      
Total retail [Member] | Financing Receivable Modified as Troubled Debt [Member]
            
Allowance related to loans categorized as troubled debt restructurings            
Total $ 644,000   $ 0